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Old 04-01-2006, 06:55 AM   #1
sbeariv
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Join Date: Apr 2006
Location: South cAROLINA
Posts: 1
sierra oil pressure

I have a fluctuating oil pressure guage. Normal driving it starts at 40 psi and raises to 60 psi. lately it has been hanging around 20 psi. I changed oil and it return to normal 4 1000 miles. then on day it dropped to 0 psi. I stopped and checked the oil which was ok. When I cranked up it went over 80 psi and it has been bouncing ever since. it is 20 psi at regular speeds. but can go over 80 psi when accellerating.
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Old 04-02-2006, 06:01 AM   #2
bigfrye
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Join Date: Dec 2005
Posts: 62
oil

Some oils fluxuate* as the viscosity gets thinner do the it heating up which is called...crap oil. My friend had a 93 blazer 350 and his oil pressure gauge did something of the same nature, but im sure you truck isn't nearly that oil. I would take your oil pressure sensor out and hook up a guage and check it out.
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